What is Rearsh?
1.
Verb. to diss, in other words put down or insult someone, or disrespect them, in a funny way. Usually follwed by OOOOOHHHHHH's.
"Bob, how could you be so dumb"
"How can you be so fucking ugly"
"OHhh snappp! He REARSHEDD!"
"OOOOHHHHHHHH"
See